Brake



'May 6, 1930.

A. Y. Donal; Er Al.

BRAKE Filed NOV. 1'7, 1927 lNgNToR l Amm. Dones BIYRoY 5.5ANFQRD ATTORNEY or their equivalents, so that an adjust riellll Patented vll/lay 6, Y'

citons io invention-" relates-f to brakes `and isy fil-r in brake For an automobile. g i,

' object ofthe invention is to fa :ilitate` 5 the adjustment fof a, brake` and especially a .brake of the' fservo? type, in which there isl a lirst shoeserving'toiapply a second shoe,

by providing means ,for predeterminin the' relative applying movements of the two s voes` the idle position of one*v f he sh esjwill cause a proportionate adjustment ofthe other shoe, thus permittin theus'eof a singlead:- ju'stment on the bra e. L-JK g In one very ydesirable arrangement, there is a guide or positioning device, illustrated as' being mounted on the' backing plate of. the brake, and which engages a .part of the fric-' tion means, such `as a camfs'lotingone ofthe shoes, in such a manner as to constrain the shoe to move both lengthwise and` radially.

Thus, as vthe shoe movesv outward against.

the drum, it also moves lengthwise' toapply' the other shoe.

has a guidearranged in a slot in a part of the `friction means and it may also have partsjarranged to serve as a stead rest preventing lateral movement ofthe rake shoes.Y k f The above and other objects, end features ofA the invention, including various`noveljand. desirable details of oonstructiom'will'be ap'- parent from the followin description 'of one' illustrative embodiment s own` in the accompanying drawing, in which:

a rotatable drum 10, at the open side of'which illustrated brake is of the three-shoe type and utilizes a Boating or servo'shoe 14, connectf 5 ed a floating p1`vot`16 to asecondarysh'oe 5 18', together' wi h an lustrated as embodied in an internalexp'andl n l f -1 Sends and being anchored'o"nfcpivotsyl.' l i brake is applied-by:wsuitablefmeanssueltas,a 'l kdouble cam 24,3` against the `'resistancefof :la: return springw.;1fdesiree.aanname 'turn'. springi28'my' bie ics'imctedtosthe n1' i anc :theinvention there is alpos'itioningrdevice In the arrangement villl'ls- ,I trated in the drawing, the positioni n'gdevice 'ment oftheA brake shoe The 'sitini-ng'v` devi Figure 1 is a vertical section'tlirough fthe* brake just inside the headof the brake drum f shoes in side eleva- Figure 2 is apartial section thro hA the. positioning device on the line there is arranged as uitable support Suchasa backing plate 12, andwithin which isfarfranged the friction means ofthe brake. The

y1S. shoes :18 and. 2 overleg)plug vat? their application oi. dieiV Y, Dod'gefv important feature ofthepresent invertti'onfrelates to thei rovisiomb'fmeans a v` ingl on one Vof -thegs tn predetermiii'ef the movement of these twosh'oesin applyi" l thefbrake In the illustrative einbodimentltl shown as includinga"postf30se`curedfto the peeking-plate 12 'by I a nut a'nd4 having a portion :34,.f of .reduced d.l l1 'eter-projectni throughfaslot 36 in'the 'stiifeningfweb o thefshoe 14. "The post 30 is- ;shoulde'red to en- 'gfage; 'a .washer 38- on Vthe ba'jcfking -platefside ofthe shoe, while anotherA waShfel held againstythefopposite sidefofl-theshoef by a y ,A provided-with' a guide. slefafev on the. portion stof heposi: vtioningfy device" and fitting possible in the cam slotQ36 formed of the shoe 114. The axis'off theea preferably extends 'lengthw 1s vso inclined withfrespect .to thef remaining brake parts as to insurefthat whentheshoe v14 is operated by 'the cam orits equiva lent, it is constrained yteifniov''e"lengthwise as well as radially, preferably in such aprnanner that .the shoes 1 4 Aand 18 engage thedrun v substantially simultaneously. An important advanta eof thisfconstruction isin that fact that it e Aiminates the necessity of having'fany separate adjustment vfor the shoe 18, beeause 10 ef weaknesses-1.

ci im fact that turning Checiimrdly @bannato-*compensate fwleair.) a

mamey-befand@ eccentricmhepare tel-1.a. nt limitlts copemthacpaf- 'anchorsd'shasar Shoe against the brake: icombinatio-i1,O

bothof-theshoes. 1

.6i A1 brake com rising, injcombination, a

-.drum,' a support a jacent the drum, a air of fshoes' engageable with the drum and aawaangagemeafof the twg-. shoes with" the ashe'whichghasa fixeasnchoifand .-W. .'el-"iS-.enaageahla with the fumi-Janin,

anchoredshoe-arran'ged'to forcethefanchored minimi 1 f l` airZIQgd to predeterminethernovement of e first of which is arranged to operate the second in applying the brake, and a. guide carried b the support and engaging the first shoe an arranged to constrain the irst shoe to force'the second shoe against the drumindependently of the action of the drum.

7 A brake comprising, in combination, a drum, a support adjacent th'e drum, arpair of shoes engageable with the drum and the first of which is arranged to operatefthe seeond in applying the brake, and a cam de- .vice engagmg one of the shoes and arranged to predetermine the relative movement of the two shoes in applying the brake.

8. A brake comprising a pair of connected shoes, one of which is anchored, in combina- Y tion with a guide which is capable of adjustment and which constrains the unanchored d'- shoe tomove in a predetermined path to ap- ,.plyfthe'anchored shoe.

9.v A brake comprising a air of connected .Y Combination wit a guide which 'pable of'adj ustment and which constrains shoe to molvein .a predetermined path to ap ly the other 'shoe'.y

\ ftestim'nywhereof, we have hereunto 'signed' our names. l ADIEL Y. DODGE.

ROY S. SANFORD. i

a. air of oonnected'shoes' within the drum an .the first of 'whchis' arranged to foreethe second a 'in ap- Plying the brake-,1mi Shoa being 2011- strained to more operate tire 'tsrmplete- 1 engage- F'arranged to 'osswithin the,

ing "the a brake, and -g'uidie mens" 'engaging saidA -rst shoe and. to' move lengthwise in applying t e'bra ve toact on :the second shoe in" alpredeterm ined proportion to its radial movementtoward'the drum. 5. A brake comprising,incombination, a drum,. a support adjacent the" drum, a pair of shoes enga able with the drum-'and the first of which is arranged to operate the second in applying' the brake, and a guide engaging t e support and one of the shoes`and 

